The server "net.tcp://localhost:7046/DynamicsNAV/Service" is either unavailable or your connection has been lost. Do you want to attempt to reconnect?

I have as user who is getting below error when trying to opening RTC,
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Microsoft Dynamics NAV
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The server "net.tcp://localhost:7046/DynamicsNAV/Service" is either unavailable or your connection has been lost. Do you want to attempt to reconnect?
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Yes No
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The user is having super role & i have sync the user.
After selecting the path (localhost:7046/DynamicsNAV)in the RTC login window, user is able to see the list of companies.
But when user selects any company error message is poped up.
There is no specific company assigned to the user.
The user is connecting through terminial.
I also tried on different user machine with Run as,but no success.

User is having Window 7 installed.
And this is happening to a single user only.
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